//-------------------------------------------------------------------
#define PIN_RGB_ROT        9
#define PIN_LED_RGB_GRUEN  6
#define PIN_LED_RGB_BLAU  10

#define PIN_ADC_POTENTIOMETER  A0

//-------------------------------------------------------------------
void setup() {
  // nix
}

//-------------------------------------------------------------------
void loop() {
  //---
  // ADC-Wert vom Potentiometer einlesen: 0...1023
  int adc_potentiometer = analogRead(PIN_ADC_POTENTIOMETER);

  //---
  // Tastgrad berechnen: 0...1023 --> 0...255
  int tg_blau = adc_potentiometer / 1023.0 * 255.0;

  //---
  // BLAU: Tastgrad 0...255
  analogWrite(PIN_LED_RGB_BLAU, tg_blau);

  //---
  // Pause 100ms (10Hz)
  delay(100);
}